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Method for spray coating alloy on heating surface of flue

A heating surface and flue technology, applied in metal material coating process, coating, fusion spraying, etc., to achieve the effect of reducing maintenance work, reducing slag hanging, and preventing accidental loss

Active Publication Date: 2007-05-09
MCC CAPITAL ENGINEERING & RESEARCH +1
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  • Summary
  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the problem of a large amount of slag hanging in the production of the converter, and provide a new alloy spraying method for the heating surface of the converter vaporization cooling flue. Alloy spraying is used on the heating surface that is prone to slag formation, such as the fixed section of the mouth, so that the heating surface is not easy to slagging, completely solves the problem of slag formation, and improves the service life of the flue, making it more suitable for practical use and has industrial utilization value

Method used

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Embodiment Construction

[0032] The specific steps, features and effects of the alloy spraying method for the heating surface of the converter vaporization cooling flue according to the present invention will be described in detail below in conjunction with preferred embodiments.

[0033] The alloy spraying method for the heating surface of the converter vaporization cooling flue proposed by the present invention mainly includes the following steps: A. flue condition inspection, B. sandblasting and derusting, C. sandblasting coarsening, D. spraying the bottom layer, E. spraying Working layer, F. Spraying surface layer, G. Sealing, H. Baking and curing. The compressed air used for spraying should be dry and clean, and the moisture content should be less than 5.8g / m 3 , oil dust particle size ≤ 0.01μm, residual oil ≤ 0.001ppmw / w.

[0034] In a project with a volume of 50m 2 In the embodiment, the operating steps of a construction cycle are described as follows:

[0035] A. Check the condition of the ...

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Abstract

This invention relates to a method for spray-coating the heating surface of the flue duct with alloy. The method comprises: (1) examining the flue duct status, and finishing the surface; (2) spraying quartz sand by 0.3 m3 sand blast machine for derusting the surface; (3) spraying metallic grit or brown corundum for coarsening the surface; (4) spray-coating Ni-Al alloy wires to obtain 40-60 mum thick vase layer; (5) spray-coating Ni-Cr-Mo alloy wires at 300-600 m / s to obtain 300-350 mum thick working layer; (6) spray-coating Ni-Cr-Ti alloy wires at arc temperature of 4000-5000 deg.C, environmental temperature of 1600-1700 deg.C and duct wall temperature of 600-700 deg.C to obtain 150-200 mum thick surface layer with binding strength of 30-50 MPa and porosity of 2-3; (7) sealing the pores with conventional sealant; (8) curing the pore-sealing layer at above 300 deg.C for 30 min.

Description

technical field [0001] The invention relates to an alloy spraying method, in particular to an alloy spraying method on the heating surface of a converter vaporization cooling flue. Background technique [0002] In the production of converters in the metallurgical industry, due to the adoption of processes such as slag splashing to protect the furnace, a large amount of slag will hang on the heating surfaces such as the converter vaporization cooling movable hood and the fixed section of the furnace mouth. The slag will reduce the cooling effect of the flue, and the cleaning hangs Slag often damages the water-cooled wall, which greatly shortens the life of the flue. The existing converter vaporization cooling flue has no technical measures to prevent slag hanging, so the service life of the heating section such as the movable hood and the fixed section of the furnace mouth is very short, and water leakage usually occurs in about half a year to a year. [0003] Alloy spraying...

Claims

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Application Information

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IPC IPC(8): C23C4/00C23C4/02C23C4/08C23C4/18C23C4/131
Inventor 张学锋朱惠民杨源满吴仕明贾京李玉芬张宏
Owner MCC CAPITAL ENGINEERING & RESEARCH
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